摘要
根据云南老厂火山岩的岩石学、岩石化学成分特征,可将下石炭统火山岩划分为5层、4旋回、4相、3个相组。其中:C_1～C_1~3为岛弧型玄武岩系列,C_1~4和次火山岩为大陆板块边沿裂谷碱性玄武岩系列,C_1~3为C_1~2钠质粗面质岩浆与C_1~4碱性玄武岩浆混合作用的产物。
The Lower Carboniferous volcanic rocks in Laochang of Yunnan may be divided into five strata, four cycles, four phases and three phase formations.C_1~1～C_1~3 belongs to the island arc type basalt series, C_1~4and subvolcanic rocksbelong to the continental plate boundary rift type alkalibasalt series,C_1~3 was produced by mixed C_1~2 sodic trachyte and C_1~4 alkalibasalt magmas.
关键词
火山岩
下石炭统
岩石学
岩石化学
volcanite
Lower Carboniferous
petrology
petrochemistry
Yunnan
Laochang
